Revenue - Summary of Revenue Disaggregated by Types and Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 14,250	$ 20,284
Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	11,470	18,874
Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	2,661	1,291
Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	119	119
U.S.
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	3,084	634
U.S. | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	1,618	0
U.S. | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	1,466	634
Outside of U.S. ("OUS")
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	11,166	19,650
Outside of U.S. ("OUS") | Product
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	9,852	18,874
Outside of U.S. ("OUS") | Service
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	1,195	657
Outside of U.S. ("OUS") | Distribution Rights
Disaggregation Of Revenue [Line Items]
Product, service and distribution rights revenue	$ 119	$ 119